diff --git a/src/router/matchers.ts b/src/router/matchers.ts
index a8652bc..2799c67 100644
--- a/src/router/matchers.ts
+++ b/src/router/matchers.ts
@@ -28,7 +28,7 @@ export class RouteMatchers extends Macroable {
    */
   uuid() {
     return {
-      match: /^[0-9a-zA-F]{8}-[0-9a-zA-F]{4}-[0-9a-zA-F]{4}-[0-9a-zA-F]{4}-[0-9a-zA-F]{12}$/,
+      match: /^[0-9a-fA-F]{8}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{4}-[0-9a-fA-F]{12}$/,
       cast: (value: string) => value.toLowerCase(),
     }
   }
diff --git a/tests/router/matchers.spec.ts b/tests/router/matchers.spec.ts
index 166f669..b9197a7 100644
--- a/tests/router/matchers.spec.ts
+++ b/tests/router/matchers.spec.ts
@@ -35,6 +35,13 @@ test.group('Matchers', () => {
     assert.equal(uuid.cast(value.toUpperCase()), value)
   })
 
+  test('uuid matcher rejects non-hex characters', ({ assert }) => {
+    const uuid = new RouteMatchers().uuid()
+
+    assert.isFalse(uuid.match.test('zzzzzzzz-zzzz-zzzz-zzzz-zzzzzzzzzzzz'))
+    assert.isFalse(uuid.match.test('gggggggg-gggg-gggg-gggg-gggggggggggg'))
+  })
+
   test('get matcher for a slug', ({ assert }) => {
     const slug = new RouteMatchers().slug()